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2023RNAAS...7..184H - Research Notes of the AAS, 7, 184 (2023/August-0)

Spectroscopic Confirmation of the Nearby, Wide-separation L Dwarf Pair CWISE J061741.79+194512.8AB.

HUMPHREYS A., MEISNER A.M., BURGASSER A.J., HSU C.-C., SCHNEIDER A.C., THEISSEN C.A., AGANZE C., GERASIMOV R., SCHAPERA N., KIRKPATRICK J.D., MAROCCO F., FAHERTY J.K., CASELDEN D., KUCHNER M.J., CUSHING M.C. (The Backyard Worlds: Planet 9 Collaboration) (The Backyard Worlds: Cool Neighbors Collaboration)

Abstract (from CDS):

We present spectroscopic confirmation of a nearby L dwarf pair, CWISE J061741.79+194512.8AB. Keck/NIRES near-infrared spectroscopy shows that the pair is composed of an L2 dwarf primary and an L4 dwarf secondary. High resolution spectroscopy of the combined light system with Keck/NIRSPEC yields a radial velocity of 29.2 ± 0.3 km s–1 and a projected rotational velocity $v\sin i\,$ = $\,{41.6}_{-2.6}^{+2.7}$ km s–1. Our spectrophotometric distance estimate places the system at 28.2 ± 5.7 pc, significantly more distant than originally estimated in Kirkpatrick et al. The angular separation of the components is 1.″31 ± 0.″14, corresponding to a projected physical separation of 37 ± 8 au.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Brown dwarfs - Low mass stars - Binary stars

Simbad objects: 3

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